The average of x and y is 5 and the average of x,y, and z is 8. What is the value of z?
a. 19
b. 14
c. 13
D. 11
e. 3
I know that the average of 7 and 3 is 5 (if 7 and 3 are x and y) but I don't know what z is.
I would solve it this way:
z+x+y=5+5+z=3*8
z=24-10
answer is b.14 add 7(x) + 3(y) + 14(try each multiple choice;0)gives u 24 divided by 3 tada 8!!!
To find the value of z, we can use the given information. We know that the average of x and y is 5, so we can set up the equation:
(x + y) / 2 = 5
Since we know the average of x, y, and z is 8, we can set up another equation:
(x + y + z) / 3 = 8
From the first equation, we can rewrite it as:
(x + y) = 10
Now, we have a system of equations:
(x + y) = 10
(x + y + z) = 24
To solve for z, we can subtract the first equation from the second equation:
(x + y + z) - (x + y) = 24 - 10
This simplifies to:
z = 14
Therefore, the value of z is 14, which corresponds to option b.